Fafnir2MM312WI DULSuper-Precision Angular Contact Ball Bearing Duplex Pair – Straight Bore, 60 mm ID, 130 mm OD, 31 mm Width, Open, 15° Contact Angle, ABEC 7/9, Light Preload, 2 Pcs

Product Description

What this part is:

Fafnir 2MM312WI-DUL is a matched duplex pair of super-precision angular contact ball bearings, ISO 7312 envelope, 60 mm bore x 130 mm outside diameter x 31 mm width per bearing. Unit Quantity: 2 Pcs.

Decoding the designation:

2MM — Fafnir super-precision spindle bearing with a 15° contact angle.

312 — the 300WI heavy series, ISO 7312 size.

WI — low-shoulder super-precision spindle execution.

CR — machined phenolic cage riding on the outer-ring land.

DU — universally ground duplex pair; the two bearings mount back-to-back, face-to-face or in tandem.

L — light preload.

7312C-T-P4S-DUL — Timken world part number for this set.

Specifications:

Bore Diameter: 60 mm. Outside Diameter: 130 mm (5.118 in). Overall Width: 31 mm (1.221 in) per bearing. Total Width: 62 mm across the pair. Contact Angle: 15°. Precision Class: ABEC 7/9 (ISO P4S). Preload: Light. Cage Material: Machined laminated phenolic. Cage Type: Outer-ring land-riding, machined. Dynamic Load Rating: 103,100 N (23,200 lbf) for the set. Dynamic Load Rating per row, ISO C1: 93,700 N (21,100 lbf). Static Load Rating: 63,500 N (14,300 lbf). Limiting Speed: 11,400 rpm grease; 22,800 rpm oil. Lubricant: grease or oil. Rolling Elements: Steel balls. Closure Type: Open. Bore Type: Straight. Series: 300WI. Material: Chrome bearing steel.

Dimensions and mounting:

Shaft Backing Shoulder Diameter: 72.6 mm (2.860 in). Housing Backing Shoulder Diameter: 117.9 mm (4.640 in). Maximum Shaft Fillet Radius: 2 mm (0.079 in). Outer Ring To-Clear Radius: 2 mm (0.079 in).

Compatibility and replacement:

Same-specification equivalents: Timken 7312C-T-P4S-DUL, NSK 7312CTRDULP4, SKF 7312 CD/P4ADGA, FAG B7312-C-T-P4S-UL. The 3MM312WI set shares the 60 x 130 x 31 mm envelope at a 25° contact angle and is a related size.

CAD model and data sheet: available from Timken (cad.timken.com).

Frequently asked questions:

What size is the Fafnir 2MM312WI-DUL?

60 mm bore, 130 mm outside diameter and 31 mm width per bearing, ISO 7312 envelope.

What is the contact angle?

15°.

What are the speed and load ratings?

Limiting speed 11,400 rpm grease and 22,800 rpm oil. Dynamic load rating 103,100 N for the set and static load rating 63,500 N.